$(function(){
	
	$.extend($.jgrid.defaults, {
		mtype: 'POST',
		datatype: "json",
		width : "100%",
		autowidth: true,
		viewrecords: true,
	   	rownumbers:true,
	   	rowNum:20,
	   	rowList:[20,50],
	   	shrinkToFit : true
	});	
});